Reamer.



F. P. MILLEM BEAMER( APPucATloN msn nov. 22. 191e..

PTH-I:

yIII` l fifi x 'G j v l '5a l l vraflmffssfs -I viver-ron 'y FRANK r.MILLER., or- MEADVILLE, PENNSYLVANIA,

REAiunn.

A Specification of Letters Patent.

Patented oet. 2a, i917.

application mea November 22, 191e.A serial No. 132,760.

Be it known .that i, FRAN a citizen of the United States, a residentl ofMeadville, in the county ofCrawford and State of Pennsylvania, haveinvented a new and Improved Beamer, of

which the followingis a. fu1l, clear, and exact description.

Among theprincipal objects which the present invention has in view are:to

tighten inserted knives in a cutter head;

to reinforce the seating pressure thereon;

to permit unrestricted movements of the cutting members; to holdv saidmembers in adjustedposition; and to lock said cutting memberspositivelyT in said cutter' head against displacement.

Drawings. Figure 1 is a side view of afcutting head provided withcutters and means for holding the same, all constructed and arranged inaccordance'with the present invention;

Fig. 2 is a longitudinal section, the section being taken as on the line2-2 in Fig. 3;

Fig. 3 is an end view of the cutter head partly in section, the viewbeing taken as on the line 3 3 in Fig. l;

Fig. 4 is a Vview of a modified form of cutter and key member therefor;

Fig. 5 is a similar view of a further modified form of the invention.

Description.

The invention as shown in the drawings is applied to a reamer head l10.The head 10 is furnished with a series of blade-holding slots, thebottoms 11 of which slots are inclined. The slots 12 which form thebottoms 11 extend through a reducing screW- -threaded section 13, thethreads whereof are engaged by threads 011v a thrust collar 14, theinclined surface 15 whereof corresponds with and overhangs the inclinedabutting. edges of the cutters 16. The collar v14: is held in adjustedposition by a lock preferably perpendicular to the bottom 11 of saidgroove. The fillets 18 are disposed,

The rear wall in each groove grooves ,-19 in the opposite side or faceof each cutter.' rThe grooves"` 19' are "complementary to grooves 20which areformed in lthe heads 10 and inthe advance side of reach ofthe'l slots 12. The grooves 19 and 20 are parallel with the bottoms 11ofthe slotsfor permitting endwise movement'of said cutters in said slots12. Preferably the fillets 18 are circular in cross section. Y

A portion of the S wall of..eachv of said grooves 19 and 20 arecylindrical and a norvtionstraight or tangential. In the originaldisposition of thefsaid grooves, the cylindrical walls are concentric.As thegrooves of the cutter` 1n whlch the groove 19 is formed wears, thecylindrical walls are forced apart, the cylindrical wall of the groove19 being moved slightly toward the bottom 11 of the slot 12.

The purpose in employing thev llets 18 is to lock the cutters 16 rigidlyin the reamer head 10, and the adjusting screws 21 are employed toreinforce thislocking c ect and to force the blade 16 over and downwardagainst the sides and bottoms respectively of the slots 12, this alsocounteracting any wear on the cutters 16er slots 12 which otherwisewould loosen the cutter in the heads 10 and slots 12. Each of the screws21 has a head 22, the under side of which is tapered to 'bear againstthe side of a fillet 18 rto wedge the same toward the cutters l 16. Thisconstruction isbest shown in Fig.

3 of the drawings.

To receive each of the screws 21, a tapped hole 23 is formed, which hasat the outer end thereof a socket 24 into which the head 22 may beinserted. The object of this is to exert an even pressure on thevfillets 18 and the cutters16 connected therewith.

. In vthe modified form of the invention shown in Fig. 4, the groove 25vis stopped short .of the cutting edge of the blade 16 to permit the useof the same for service pressing.

In the modified form of the invention shown in Fig. 5, a ridge 26 isformed integral with the cutter 16 as a substitute for the fillets 18 ofthe earlier described form of the invention.

In practice it will be observed that when any cutter 16 is to beremoved, the screws 21 are preliminarily loosened until the pressure. ofthe heads 22 thereof is removed from the fillets 18 with which saidscrews coperate.

The particular cutter 16 and illet associated therewith is then drawn,from the head and from the slot 12 in which it is disposed.

When the cuttersl are placed in the head 10 and slots 12 thereof,y thescrews l 21 are setup until the tapered portion thereof un der the heads22 of the said screws engages the fillets 18 and wedges the same hardagainst the cutters 16, forcing the said cutters firmly against the sidewall and bottom of the slots 12 to yprevent chatter or dislodgment ofsaid cutters. Owing to the for- Amation of the grooves 19 and 20, thefillets 18 on the grooves 19 are pressed downward. rlhe removal of themetal of the head 10 to form the straight wall of the groove 20 per-lmits this movement of the fillets 18. lin this manner the cutters 16 areforced and held more readily in the slots 12 'thanI would otherwiseresult. l

While the slots 12 in the reamer head 10 have been shown and describedas having bottoms 11 inclined rearwardly, a similar result may beobtained by reversing the inclination of the bottoms 11 so that insteadof expanding the cutters 16 as they are drawn from said slots, they willexpand when they are moved into said slots.

Ola'ima 1. A reamer comprising a. head having a plurality of outwardlyopening slots for holding cutters, said slots having inclined bottoms, aplurality of cutters having inclined' base surfaces, wedging membersopnaaaaar bottoms and longitudinal grooves, a plural-- ity of cuttershaving inclined base surfaces and longitudinal grooves, a pluralityofscrews operatively mounted in said head adjacent saidslots, saidscrews having laterally extended heads and tapered-sections intermediateythe peripheries of said heads and the peripheries of the Shanks ofsaidscrews; and a plurality of cylindrical key rods in" the grooves of thehead and cutters for engagement by the tapered sections of the screws.

3. A reamer comprising a head having formed therein a series of parallelslots,y A

each of said slots having in one wall thereof a keygroove; a pluralityof cutters, each of said cutters having a key groove formed in the facethereof, said groove being complementary to the first-mentioned groove;a plurality of removable fillet members adapted to rest in said grooves;and means engaging said fillet membersfor pressing said cutters againstone wall and the bottoms of said slots. .A

FRANK l?. MILLER.

